Steam PS3 overlay is similar to PC version

Once you've booted up your copy of Portal 2 PS3, a simple press on the Select button is all it takes to bring up the Steam overlay. If you're familiar with Steam already, the PS3 overlay will look very familiar.

The PS3 overlay has access to chat, Portal 2 news, your friends list, and achievements. Doing actions like linking your PSN ID to a Steam account, sending out invites, and starting chats are just a couple of button presses away.

There are a few minor restrictions to note: Portal 2 trophies can unlock their corresponding Steam equivalent but not the other way around. Also, PS3 Steam Cloud saves can't be used with PC versions of Portal 2.

Yeah I was going to mention that. You're a lot more likely to make an online account if it's free.

and tbh since u can just decide what region your in, alot of people make atleast 2 accounts as the american/european/japanease stores get items unique to them...I can't think of an example off the top of my head but there are a couple